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Speech-controlled mobile robot
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Microphone support Manual and CPU modes available Response time less than 300 milliseconds (ms) 5 volt (5V) power supply Circuit construction The speech-recognition circuit is available in kit form from Images Company (see the parts list at the end of the chapter). The schematic is shown in Fig. 7.1. The components can be mounted and wired on a standard printed circuit board (PCB). Solder the keypad to the board according to Fig. 7.2. You will have just seven wires from the keypad to the HM2007 on the PCB. The number next to each wire coming out of the keypad refers to the pin number it s connected to on the HM2007 IC. Figure 7.3 shows the top view of the parts placement on the PCB. Figure 7.4 is the complete speech-recognition circuit. Independent recognition system This demonstration circuit allows you to experiment with dependent as well as independent systems. The system is typically trained as speaker dependent, meaning the voice that trained the circuit also uses it. We will take the other track and train the system for speaker independent recognition. To accomplish this we will use four word spaces for each target word. To simplify the digital logic, the allocation of word spaces is as follows. Our circuit will only look at the first [least significant digit (LSD) on the display] digit space for recognition. This means that the word spaces 01, 11, 21, and 31 will all be recognized as the same word. Since we are only decoding the first digit, they all look like word space 1. Likewise word spaces 04, 14, 24, and 34 all look like word space 4. This system works most of the time, but a problem is encountered when an error code pops up. 55 word too long 66 word too short 77 no word match found Obviously the base circuit would identify these error codes as word 5, 6, and 7, respectively. There are two ways to work around this problem. The first way is to use a dedicated logic circuit
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7.1 Schematic of speech-recognition circuit
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7.2 Keypad wiring to speech-recognition circuit
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7.3 Top view of parts placement on PCB
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(see Fig. 7.5) that brings a line high when the digits 5, 6, or 7 appear in the most significant byte (MSB). This line becomes an enabledisable line. This circuit brings the line high when the digits 5, 6, or 7 are displayed, so an interface should interpret this line going high as a disable.
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7.4 Finished speech-recognition circuit
From 74LS373 19 16 OR
Disable High
Enable Low
Error Code Detection from MSB of 74LS373
7.5 Error detection circuit taken from upper BCD number
The second way to work around the problem is to simply use a PIC microcontroller to read the entire 8-bit output from the SRC. Any word number above 40 is an error and should be ignored. While we are not interfacing this circuit to a microcontroller here, it should be evident to anyone who has worked with the PICBASIC compiler and PIC chips (see Chap. 6) in other applications that this interface would not present a problem. In Chap. 15 we use a PIC inside the speech-controlled circuit for controlling a robotic arm. The 8-bit output is taken from the output of the 74LS373 data octal latch. The output is not a standard 8-bit byte, but it is broken into two 4-bit binary coded decimal (BCD) nibbles. BCD code is related to standard binary numbers as Table 7.1 illustrates.
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Speech-controlled mobile robot
I Table 7.1
Decimal
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
Binary
0000 0001 0010 0011 0100 0101 0110 0111 1000 1001 1010 1011 1100 1101 1110 1111 0001 0000 0001 0001 0001 0010 0001 0011 0001 0100
0000 0001 0010 0011 0100 0101 0110 0111 1000 1001 0001 0000 0001 0001 0001 0010 0001 0011 0001 0100 0001 0101 0001 0110 0001 0111 0001 1000 0001 1001 0010 0000
As you can see, the binary and BCD numbers remain the same until reaching decimal 10. At decimal 10, BCD jumps to the upper nibble and the lower nibble resets to zero. The binary numbers continue to decimal 15, and then jump to the upper nibble at 16 where the lower nibble resets. If a computer is expecting to read an 8-bit binary number and BCD is provided, this will be the cause of errors.
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